Description:Sclerocactus parviflorus subs. havasupaiensis is an extremely endangered subspecies of Sclerocactus parviflorus. It is (usually) a single spherical to oblong cactus with pink, pleasantly perfumed flowers. This subspecies shows similarities with Sclerocactus polyancistrus which occurs in the Death Valley in California. Stem: 5 to 30 cm long and 3-11 cm in diameter. Flowers: Purple, white bell-shaped 3 to 5.5 cm long and 3 cm wide. The flowers appear in a ring around the apex. Blooming season (in habitat): It blooms in April to May.

Subspecies, varieties, forms and cultivars of plants belonging to the Sclerocactus parviflorus group

Cultivation and Propagation: Rarely seen in cultivation, it needs perfect drainage to flourish. It is quite difficult to grow on its own roots and to propagate (only 2-3 percent of seeds germinate ). Mature individuals easily rot and die.It is indispensable to provide a greenhouse with good ventilation and full sun exposure. Keep totally dry during winter. It can tolerate temperature below zero (-20° C). Plants grafted on hardy Opuntia humifusa stock are quite easy to grow, and no special skill is required.Propagation: Seeds are extremely difficult to germinate (only 2-3 percent of seeds germinate). Grafting is often used to speed growth rate and to create a back-up for plants in collection.